Evolution and Wheels
In the past, evolutionary biologists contemplating the absence of wheels in nature agreed that the explanation wasnot undesirability: wheels would be good for animals, just as they are for us. Animals were prevented from evolving wheels, the biologists reasoned, by the following dilemma: living ce
（三）关于梦想的英语作文 Dream
A dream is an inexhaustible（用之不尽的） source of energy that keeps our enthusiasm burning, and kindles our desire to enhance our spiritual cultivation, r
（一）关于运动的英语作文What We Want from Sports
Many students go to the playground when they tired after a few hours of study, These students put much moretress on their study effici
